Feed mechanism for bab and tube gbindiwg machines



Feb 3, 1931. A. ,1. KOON FEED MECHANISM FOR BAR AND TUBE GRINDING MACHINES Filed June 25 1928 2 Sheets-Sheet 1 Feb. 3, 1931. J KOON FEED MECHANISM FOR BAR AND TUBE GRINDING MACHINES Filed June 25, 1928 2 Sheets shet 2 mm mammal-Q Patented Feb. 3, 1931 it res ARTHUR J. KOON,'OF GRAND RAPIDS, IVIICI IIGAN FEED MECHANISM non BAR AND TUBE GRINDING MACHINES Application filed June 25,

5 tudinal feed of the work past the turning or grinding tool. Among the main objects of the invention are, to provide a feed mechanism well adapted to feed thin wall tubes withoutdanger of deforming or indenting 1. them; to provide a feed mechanism easily and quickly adjustable to bars and tubes of varying diameters; to provide a feed mechanism of the type comprising a plurality of feed rollers grouped around the axis of thework, wherein the rollers'may be easily'adjusted to the desired angle to theaxis of the work, col.- responding to the rate of feed desired; to provide a feed mechanism employing a pair ofpositively driven rollers, in cooperation with a presser roller maintaining the work in engagement with the feed rollers ;v and to pro vide an improved roller drive mechanism for the feed rollers which will permit both in and out bodily adjustment of the feed rollers and angular adjustments thereof without disturbing the operativeness of the driving mechanism of the feed rollers, 0r requiring any adjustment of the roller drive mechanism.

Still' other objects and attendant advan- 139 tages of the invention will be apparent to persons'skilled in the art as the same becomes better understood by reference to the following detailed description, taken in connection with the accompanying drawings in which 1 have illustrated a practical and workable embodiment of the principle of the invention, and whereinp Q Fig. 1 is a side elevation, partly in section through the driving mechanism, of my improved feed device; j s I Fig. 2 is a view taken at right angles to that of Fig. 1, partly in elevation and partly in vertical section on'the line 22 of Fig. 1;

Fig. 3 is a cross-section on the line 33 of Fig. 2;

Fig. 4 is a cross-section on the line H of Fig. 2; r

In an application filed co'ncurrentlyherewith, Serial No. 288,011, I have disclosed and claimed an improved work support or steady 1928. Serial no. 288,010.

rest designed to be located one on each side of the turning tool or grinding wheel to hold the work in perfect alinement while subjected to the finishing operation. This. de-

vice, briefly describechcomprises a group of three rollers suitably mounted on an upright supporting frame and disposed more than ninety'degrees apart around the axis of the work, with roller-supportingand carrying means adjustable toward and from the work and also adjustable angularly so as. to angle- AIEN T .FF' 1 the rollers according to the spiral or pitch of the feed, one of the said rollers being springp'ressed toward the workso as to forcethe latter into engagement with the'otherf two rollers, said other two rollers beingunyield ing in a direction radial to the work. The feed mechanism of my present invention employs the same rollers and roller-supporting V and adjusting devices as are disclosedand claimed in the aforesaid companion application, and addsthereto a novel mechanism for positively driving the two rollers against which the work is pressed by the presser roller, so as to effect rotation and a positive feed of the'work past the surface of the tool.

First briefly de. roller-si ipportmg and adjusting devices, '10

designates as an entirety avertical. C-frame' on which the roller carriers, rollers, and their scribingthe rollers and adjusting and driving devices are mounted The structural details of the lower (vertical):

and intermediate (horizontal) roller-carrying and adjusting devices are identical and will, therefore, be identified-by the same reference characters, and a description of one will suffice for both. Cast or otherwise formed on or in the'frame 1O is a cradle 11 which, in cooperation with a pair of gibs 12 secured to the outer longitudinal edges of the cradle by screws 13, constitutesa slideway for the flat base 14 of a longitudinally split cylinder 15 that constitutes a slide and clamp for'the cylindrical stem 16 of a roller car rier. The split'side of the cylinder 15 is formed with apertu redlugs'17,through 0pposed pairs Of'fWhlCh ispassed a clamp screw 18 that screws into a. sleeve nut 19 fitted into an aperture of one of the lugs 17' and locked gularly adjusted position.

against turning by a key 20. The screw 18 is formed with a squared head 18' adapted to receive a wrench for securely clamping thestem 16 of the roller carrier in any an- The cylindrical stem 16 of the roller carrier is formed on its inner end with a head 21, on the face of which are seated a pair of opposed journal boxes 22 and 23 internally shaped to receive anti-friction bearings 24 for the shaft 25 of awork-engaging roller 26. As will be observed by reference to Fig 2, the periphery of the roller 26 is preferably slightly concave, the object of this being to cause the roller, when operating'at an angle to the axis of the work, represented by the tube T, to engage the latter with a line contact. The journal boxes 22 and 23 are attached to the'carrier head 21 by screws 27 entered from the under side of the head 21 v into the lower sides of the journal boxes. A

gage for indicating the angular of the roller may consist of graduated scale division marks 28 (Fig.2) on the inner end of the roller car ier clamp 15 cooperating with a pointer 29' on the stem '16 of the'roller carrier. I o

On the inner side of the clamp slide 15 is an integral lug 30 formed with a threaded aperture 30 to receive a lead screw 31 that is rotatably mounted at-32 in a wall of the cradle-11 and is confined against endwise movement by collars 33 and 34 thereon. The outer end of the lead screw 31 has a squared head '31 for the application of a wrench to effect adjustment of the roller carrier and roller toward and from the work, as required by the diameter of the latter the adjusting" screw 31 thus holds the roller carrie uryielding in a direction radialto the work. The carrying and adjustlng means for the upper presser roller 26 are to some extent similar to those of the lower and intermediate rollers E26 but slightly modified to maintain the engagement of the roller 26 with the work under yielding sprlng pressure. As

shown at the top of Fig. -1 and in Fig. 4, a

' groove 16 inthelroller carrier stem 16' so as to lock the latter against rotation while permitting it to slide freely 'endwise when the bushing 37, is clamped against rotation. In the stem 16 is an axial recess or socket 38 forminga-chamber for a spiral thrust spring 39 the lower end of which foots on the bottom of the socket. Extending through the spring 39 is a movement-limiting rod 40 threaded into the stemv 16 below the recess 38 and at its upper end extending through an opening 41 in acap piece 42 that coversthe upper end of the bushing 37 and is secured to the cylinder by cap screws 43. The upper end of the rod is threaded toreceive an adjusting nut 44. From the foregoing it will be. seen that by loosening the clamp screws 18 all of the .rollercarriers can be angularly adjusted about their longitudinal axes whereby to set the rollers 26, 26 at an angle to the axis of the work corresponding to the rate of feed desired, and again tightened to maintain the rollers in set position. By manipulating the lead screws 31, the lower and intermediateroller carriers can be bodily adjusted as required by the diameter' ofthe work; and by manipulating the adjusting nut 44 the presser roller 26 can be correspondingly set according to the diameter of the work. If greater adjustment than that aii'orde'd by the nut 44 is required, the clamp screws 36"can be loosened, and-the cylinder 35 adjusted upwardly andl'again' clamped in its new position. The adjusting nut 44 will normally be out of contact :with the top of the cap, 42 when the rollerf26' is engaged with the. work, so as to make the thrust of the spring 39 effective on theroller26. By reference to Fig. lit will be observed.

carrier engages the work at a point diaietrically opposite to the point.o fcontact of the grinding wheel (indicated at G in Fig.

that the roller 26" of the horizontal roller 1) and the top roller 26 and the bottom roller 26 engage the work at points on the opposite side of the vertical plane in which the axis of'the work lies from that on which the point of contact of the other roller 26" lies; or in other words,the points of contact of the three rollers on the work are more than 1- nin'ety degrees and less than one hundred and eighty degrees apart; The work is thus so held that it cannot accidentally squeeze out between any two of the rollers, and the spring thrust of the toproller 26 always maintains the work in contact withthe rollers26 and 26". The described relation of l the. three points of contact with the work remainsthe same between the minimum and maximum' limits of workdiameters within the capacity of the. device. This insures theholding of the work in fixed position during its feed past the grinding wheel and prevents anyspri'nging'away from the latter, so that all high moved by the grinding wheelQ I The mechanism as thus far described is substanti ally identical with that forming the subject-matter of my'companion application hereinabove identified, when serving as a spots and excess surface material aroma-F125,

Isa

work support. orv-stead-y rest. This mechanishi has, in accordance with my presentinvention, been converted intoa positive feed mechanism for rotating. the work and ads vancing it past the finishing tool, through the provisionv of a driving mechanism operative upon the two rollers 26 and 2-6 by which the latter are caused to operate as feed rollers, in all bodily and angularly adjusted positions thereof.

Describing this driving mechanism, and referring to Fig. 2, the outer end portion of each roller carrier stem 16 is made hollow, and in said outer end is journaled a sleeve having on its lower end a bevel gear 46, which meshes with a mating bevel gear 47 on the outer end of an inclined shaft 48, which shaft is j ournaled at its lower end in a gear box 49 mounted on and carried by the roller carrier stem 16 and at its upper end in a gear box 50 attached to and forming an exe tension of the journal box 23 of the roller 26. On the upper end of the shaft 48 is a bevel pinion 51 driving a bevel gear 52 fast on a shaft 53 j ournaled in the gear box 50. vOn the inner end of shaft 53 is a spur gear 54 driving a spur gear 55 fast on the roller shaft 25. Splined in the sleeve 45 is a transmission shaft 56 extending into a gear box 57 and having fast thereon a bevel gear 58, the outer end of the shaft being journaled in an antifriction bearing 59. v

Referring to Fig. 1, 60 designates a power shaft extending through and transversely of the frame 10, fast on which'is a gear 61 meshing with and driving a gear 62 journaled on the frame 10. Fast with the gear 62 is a bevel gear 63 meshing with and driving a bevel pinion 64 fast on an inclined drive shaft 65 that is journaled at its opposite ends in the gear boxes 57 and an intermediate bearing bracket 66 on the frame 10. Through the drive shaft 65, driven from the power shaft 60, rotation is imparted to the two transmission shafts 56, and thence to the rollers 26 and 26 through the transmis sion mechanism previously described and fully illustrated in Fig. 2. The slip jointbetween the transmission shaft 56 and bevel gear 46' maintains the integrity of the drive under in and out bodily adjustments of the roller carrier; and, since the transmission shafts 56 are in axial alinement with their respective roller carriers and the transmission mechanisms therefrom to the rollers are bodily carried by the roller carriers, angular ac justment of the rollers and their carriers can also be made without interfering withthe operativeness of the roller driving mechanism.

The drawings and foregoing description set forth a desirable and e icient embodiment of from the principle of the invention or sacrificing any. of the adwantages thereof. Hence, I do. not limit the invention to the precise embodiment shown but reserve such variations, modifications and mechanical spirit andpurequivalents as fallwithin the View of thevclaims.

1. Inka feed mechanismfor {bar and tube grinding machines, the combination of an upright frame, a pair of opposed roller carriers swiveled on said frame. in axial ali-nementwith each other,ia, third. roller carrier swiveled on said frame on. an axis at right angles-to the axes of said pair of roller. car:- riers, work-engaging rollers j ournaled on the inner ends of said carriers, a springurging one of said opposed carrier-steward the work, means for locking all of said carriers against turning with their rollers set atiany predetel-mined. angle to. the axis. of the work, av drive shaft, and transmission gearing therefrom to the rollers of said. other opposedcarrier andzthirdi carrieroperative to drive said rollers in. any angularly ad usted position of saidlast-named carriers.

2. In a. feed mechanism foobar and tube grinding machines, the combination of an upright frame, a pair of opposed vertical roller carriers swiveledonsaid framein axial alinement with each other, ahoriZonta-l roller carrier. swiveled on said, frame midway: between said vertical carriers,work-engaging rollers j ournaled on the inner ends of said carriers, a spring urging one of said vertical carriers toward the work, means for adj usting said carriers bodily toward; and from the work, means for locking said carrier's against turningwith their rollers set'at any. prede termined angle'to the axis of the work, a

ends of said carriers, means'for pressing the work against saidrollers, means for locking said rollers in'any angularly a djustedf position, transmissionshafts disposed coaxially with the, respective carriers, transmission gearing from each of, said shafts to one of said rollers, said transmission gearing being drive. shaft,--and transmission. gearingthere- I ight flia'me', a pair of roller carriersswiveled on sa d'frame' atan angle to each other, workengaging rollers ournaled n the proximate mounted on and bodily adjustable with the a carrier of the roller. driven thereby, and means for driving said'transmission shafts.

.4. In, a feed mechanism. for barzand tube grinding machines, the combination of an 'uprlght frame, a. pair of roller carriers swiveled on said frame at an angle to. each other,

work-engaging rollers'journaled on the proximate ends ofsaid carriers, means for pressing the work against said rollers, means for bodily adjusting said carriers and their rollers toward and from the work, means for locking said rollers in any angularly adjusted position, transmission shafts disposed coaxially with'the respective carriers, transmission gearing from eachof said shafts to one of said rollers, said transmission gearing being mounted on and bodily adjustable with-the carrierof the roller driven thereby and including a bevel gear journaled in the carrier and splined on the inner end of the transmission shaft, other bevel gears fast on the outer ends of said transmission shafts, and a drive shaft carrying bevel gears at its ends in mesh with said last-named bevel gears. i

5. In a feed mechanism for bar and tube grinding machines, the combination of an upright frame, two angularly disposed roller carriers swiveled on said frame, work-engaging rollers journaled on the proximate ends of said carriers and angularly adjust-- right frame, three angularly disposed roller carriers swiveled on said frame, work-engaglng rollers ournaledon the proximate ends of said carriers andangularly adjustable relatively to the'aXis of the work under a turning movement of said roller carriers, a spring urging one of said'oarriers toward the work,

means holding the other two carriers unyieldmg in a dlrection radlal to the work, means for'locking all of said carriers against turn ing with their rollers set at any predetermined angle to the axis of the work, and driving means for the rollers of said other two carriers operative in any angular adjustment of said rollers. V

7. In a feed mechanism for bar and tube grinding machines, the combination of an upright frame, three angularly disposed roller carriers swlveled on said frame, work en a in rollers 'ournaled on the inner ends of said carriers and angularlyadjustable relatively to the axis of the work under a turning movement of said roller carriers, a spring urging one of said carriers toward the work, means for bodily adjusting the other two carriers'toward and from the work, said means also holding said other two carriers unyield 111g in a direction radial to the work, means r for looking all of said carriers against turning with their rollers set at any predeter-- iiso 

